package com.aos.erp.manager.rest.sys;

import io.swagger.annotations.Api;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import cn.apiclub.captcha.Captcha;
import cn.apiclub.captcha.backgrounds.GradiatedBackgroundProducer;
import cn.apiclub.captcha.gimpy.FishEyeGimpyRenderer;

/**
 * @program: erp
 * @description: 验证码
 * @author: tanzhiyu
 * @create: 2018-11-07 16:25
 **/
@Api(value = "验证码", tags = {"验证码API"})
@RestController("RESTCaptchaController")
@RequestMapping("/api/captcha")
public class CaptchaController {

    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    private static int captchaExpires = 3 * 60; //超时时间3min
    private String randString = "0123456789";//随机产生只有数字的字符串
    private int width = 95;// 图片宽
    private int height = 25;// 图片高
    private int lineSize = 40;// 干扰线数量
    private int stringNum = 4;// 随机产生字符数量


    @RequestMapping(value = "getcaptcha", method = RequestMethod.GET, produces = MediaType.IMAGE_PNG_VALUE)
    public @ResponseBody
    byte[] getCaptcha(HttpServletResponse response) {
        String uuid = UUID.randomUUID().toString();
        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();
        g.fillRect(0, 0, width, height);//图片大小
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小
        g.setColor(getRandColor(110, 133));//字体颜色
        // 绘制干扰线
        for (int i = 0; i <= lineSize; i++) {
            drowLine(g);
        }
        // 绘制随机字符
        String randomString = "";
        for (int i = 1; i <= stringNum; i++) {
            randomString = drowString(g, randomString, i);
        }
        g.dispose();
        //将验证码以<key,value>形式缓存到redis
        redisTemplate.opsForValue().set(uuid, randomString, captchaExpires, TimeUnit.SECONDS);

        //将验证码key，及验证码的图片返回
        Cookie cookie = new Cookie("captchaCode", uuid);
        cookie.setPath("/");
        //cookie.setDomain(domainName);
        cookie.setMaxAge(5 * 60);
        response.addCookie(cookie);
        //response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容
        //response.setHeader("Cache-Control", "no-cache");
       // response.setDateHeader("Expire", 0);
        ByteArrayOutputStream bao = new ByteArrayOutputStream();
        try {
            ImageIO.write(image, "png", bao);
            return bao.toByteArray();
        } catch (IOException e) {
            return null;
        }
    }

    private Random random = new Random();

    /**
     * 获得字体
     */
    private Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }

    /**
     * 获得颜色
     */
    private Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);
    }

    /**
     * 绘制字符串
     */
    private String drowString(Graphics g, String randomString, int i) {
        g.setFont(getFont());
        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
                .nextInt(121)));
        String rand = String.valueOf(getRandomString(random.nextInt(randString
                .length())));
        randomString += rand;
        g.translate(random.nextInt(3), random.nextInt(3));
        g.drawString(rand, 13 * i, 16);
        return randomString;
    }

    /**
     * 绘制干扰线
     */
    private void drowLine(Graphics g) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(13);
        int yl = random.nextInt(15);
        g.drawLine(x, y, x + xl, y + yl);
    }

    /**
     * 获取随机的字符
     */
    public String getRandomString(int num) {
        return String.valueOf(randString.charAt(num));
    }

}
